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id="618271c92a7d828464a7d146" onclick="toggle("618271c92a7d828464a7d146")"><table><tr><td style="padding-left: 4px">Exploring a 3D Structure</td><td><span class="glyphicon glyphicon-triangle-bottom" id="glyph618271c92a7d828464a7d146"></span></td></tr></table></div><div class="item hidden" id="618274c904fb9835c6ae189a"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/exploring-a-3d-structure/overview">Overview</a></td></tr></table></div><div class="item hidden" id="618271f904fb9835c6ae1892"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/exploring-a-3d-structure/structure-summary-page">Structure Summary Page</a></td></tr></table></div><div class="item hidden" id="6182729704fb9835c6ae1893"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/exploring-a-3d-structure/structure">Structure</a></td></tr></table></div><div class="item hidden" id="618272c004fb9835c6ae1894"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/exploring-a-3d-structure/annotations">Annotations</a></td></tr></table></div><div class="item hidden" id="618272e004fb9835c6ae1895"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/exploring-a-3d-structure/experiment">Experiment</a></td></tr></table></div><div class="item hidden" id="618272fb04fb9835c6ae1896"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/exploring-a-3d-structure/sequence">Sequence</a></td></tr></table></div><div class="item hidden" id="6182730904fb9835c6ae1897"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/exploring-a-3d-structure/genome">Genome</a></td></tr></table></div><div class="item hidden" id="6182731a04fb9835c6ae1898"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/exploring-a-3d-structure/ligands">Ligands</a></td></tr></table></div><div class="item hidden" id="6182732a04fb9835c6ae1899"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/exploring-a-3d-structure/versions">Versions</a></td></tr></table></div><div class="group show" id="6256b2b3b4396e45e97bf3de" onclick="toggle("6256b2b3b4396e45e97bf3de")"><table><tr><td style="padding-left: 4px">Grouping Structures</td><td><span class="glyphicon glyphicon-triangle-bottom" id="glyph6256b2b3b4396e45e97bf3de"></span></td></tr></table></div><div class="item hidden" id="62fbafaf3b6e49562fa5c055"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/grouping-structures/overview-grouping-structures">Overview: Grouping Structures</a></td></tr></table></div><div class="item hidden" id="6081c10aec901916050494be"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/grouping-structures/sequence-based-clustering">Sequence-based Clustering</a></td></tr></table></div><div class="item hidden" id="6256b3269c3931864b07285b"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/grouping-structures/grouping-search-results">Grouping Search Results</a></td></tr></table></div><div class="item hidden" id="6256b35e9c3931864b07285c"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/grouping-structures/group-summary-pages">Group Summary Pages</a></td></tr></table></div><div class="item hidden" id="6364336066d6046810db7f11"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/grouping-structures/explore-sequence-alignments-in-3d">Explore Sequence Alignments in 3D</a></td></tr></table></div><div class="group show" id="5fd3e3a6eb210c2c5632d098" onclick="toggle("5fd3e3a6eb210c2c5632d098")"><table><tr><td style="padding-left: 4px">3D Viewers</td><td><span class="glyphicon glyphicon-triangle-bottom" id="glyph5fd3e3a6eb210c2c5632d098"></span></td></tr></table></div><div class="group hidden" id="5f98cc9614cc37a34de620ea" onclick="toggle("5f98cc9614cc37a34de620ea")"><table><tr><td style="padding-left: 24px">Mol*</td><td><span 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id="5ee1192f25aa7b208a9fe3a3"><table><tr><td class="title" style="padding-left: 44px"><a href="/docs/3d-viewers/mol*/managing-the-display">Managing the Display</a></td></tr></table></div><div class="item hidden" id="5ee13ac17f50f44e6aa4fb1f"><table><tr><td class="title" style="padding-left: 44px"><a href="/docs/3d-viewers/mol*/common-actions">Common Actions</a></td></tr></table></div><div class="item hidden" id="5ee231607f50f44e6aa4fb20"><table><tr><td class="title" style="padding-left: 44px"><a href="/docs/3d-viewers/mol*/faqs-scenarios">FAQs/Scenarios</a></td></tr></table></div><div class="item hidden" id="5ee253237f50f44e6aa4fb22"><table><tr><td class="title" style="padding-left: 44px"><a href="/docs/3d-viewers/mol*/mol*-cheat-sheet">Mol* Cheat Sheet</a></td></tr></table></div><div class="item hidden" id="60075352c5ab5836659ab2e3"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/3d-viewers/jmol">Jmol</a></td></tr></table></div><div class="item hidden" id="65a4b499c76ca3abcc925d0d"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/3d-viewers/ngl-to-mol*-ui-migration-guide">NGL to Mol* UI Migration Guide</a></td></tr></table></div><div class="group show" id="5fd3e3f4eb210c2c56332c65" onclick="toggle("5fd3e3f4eb210c2c56332c65")"><table><tr><td style="padding-left: 4px">Sequence Viewers</td><td><span class="glyphicon glyphicon-triangle-bottom" id="glyph5fd3e3f4eb210c2c56332c65"></span></td></tr></table></div><div class="item hidden" id="60103d1ab1afe64903398251"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/sequence-viewers/sequence-annotations-viewer">Sequence Annotations Viewer</a></td></tr></table></div><div class="item hidden" id="60342ff52087e87def0d0b09"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/sequence-viewers/sequence-annotations-in-3d">Sequence Annotations in 3D</a></td></tr></table></div><div class="item hidden" id="5fc7f2843fb4b83beb6a7a3d"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/sequence-viewers/genome-view">Genome View</a></td></tr></table></div><div class="item hidden" id="60182dc1ecb9a74be53123aa"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/sequence-viewers/protein-sequence-alignment-view">Protein Sequence Alignment View</a></td></tr></table></div><div class="group show" id="60132e62aeeea33d3f095fa8" onclick="toggle("60132e62aeeea33d3f095fa8")"><table><tr><td style="padding-left: 4px">Tools</td><td><span class="glyphicon glyphicon-triangle-bottom" id="glyph60132e62aeeea33d3f095fa8"></span></td></tr></table></div><div class="item hidden" id="60132e6a610d04019e01d4c2"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/tools/pairwise-structure-alignment">Pairwise Structure Alignment</a></td></tr></table></div><div class="group show" id="601024f3244a4309df5d6630" 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24px"><a href="/docs/additional-resources/electron-microscopy-software">Electron Microscopy Software</a></td></tr></table></div><div class="item hidden" id="60135c8f236b8b22a9824a4a"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/additional-resources/modeling-and-simulation-software">Modeling and Simulation Software</a></td></tr></table></div><div class="item hidden" id="6010260ee244795fc6dcb83a"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/additional-resources/file-readers">File Readers</a></td></tr></table></div><div class="item hidden" id="6010260ee244795fc6dcb83d"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/additional-resources/nmr-software">NMR Software</a></td></tr></table></div><div class="item hidden" id="6010260ee244795fc6dcb83c"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/additional-resources/molecular-graphics-software">Molecular Graphics Software</a></td></tr></table></div><div class="item hidden" id="6168521eef055f03d1f2231b"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/additional-resources/sars-cov-2-and-covid-19">SARS-CoV-2 and COVID-19</a></td></tr></table></div><div class="item hidden" id="60102b1ab1afe6490339824f"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/additional-resources/sequence-analysis">Sequence Analysis</a></td></tr></table></div><div class="item hidden" id="6010260ee244795fc6dcb83e"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/additional-resources/structure-classification-and-analysis">Structure Classification and Analysis</a></td></tr></table></div><div class="item hidden" id="6317770e831916e52206a1ea"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/additional-resources/structure-prediction">Structure Prediction</a></td></tr></table></div><div class="item hidden" id="63dc03c2c031758bf1c30ff0"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/additional-resources/data-management-standards-and-best-practices">Data Management Standards and Best Practices</a></td></tr></table></div><div class="item hidden" id="6010260ee244795fc6dcb837"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/additional-resources/structure-validation-and-quality">Structure Validation and Quality</a></td></tr></table></div><div class="group show" id="600217ee5b6ad53203751b79" onclick="toggle("600217ee5b6ad53203751b79")"><table><tr><td style="padding-left: 4px">Programmatic Access</td><td><span class="glyphicon glyphicon-triangle-top" id="glyph600217ee5b6ad53203751b79"></span></td></tr></table></div><div class="item show" id="602d94713fed9e549afd7926"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/programmatic-access/file-download-services">File Download Services</a></td></tr></table></div><div class="item show" id="60398336fec59804432bfc37"><table><tr><td class="title" style="padding-left: 24px"><a class="docs-index-link" href="/docs/programmatic-access/web-apis-overview">Web APIs Overview</a></td><td><span class="glyphicon glyphicon-chevron-right"></span></td></tr></table></div><div class="item show" id="60183326ecb9a74be53123ab"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/programmatic-access/batch-downloads-with-shell-script">Batch Downloads with Shell Script</a></td></tr></table></div><div class="item show" id="610337d7ef055f03d1f222b9"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/programmatic-access/migrating-from-legacy-apis">Migrating from Legacy APIs</a></td></tr></table></div><div class="item show" id="60033e6ccff89d5fc8f8a3f2"><table><tr><td class="title" style="padding-left: 24px"><a href="/docs/programmatic-access/access-to-legacy-theoretical-models">Access to Legacy Theoretical Models</a></td></tr></table></div></div></div></div><div class="col-lg-9 col-md-8 col-sm-12 content-item"><div data-elastic-include><h5 class="menu-path">Programmatic Access</h5><h1>Web APIs Overview</h1><div><p>The Application Programming Interface or APIs provide programmatic access to the PDB archive. APIs that power the <a href="/" target="_blank">rcsb.org</a> website are:</p> <ul style="list-style-type:disc;"> <li><b><a href="#data-api">Data API</a></b> serves to retrieve data when you know the PDB identifier</li> <li><b><a href="#search-api">Search API</a></b> serves to find out what identifiers match a certain search condition</li> <li><b><a href="#modelserver-api">ModelServer API</a></b> is a service for accessing subsets of macromolecular model data</li> <li><b><a href="#volumeserver-api">VolumeServer API</a></b> is a service for accessing subsets of volumetric data</li> <li><b><a href="#1d-coordinate-server-api">1D Coordinate Server API</a></b> serves alignments between structural and sequence databases and integrates protein positional features from multiple resources</li> <li><b><a href="#alignment-api">Alignment API</a></b> provides a streamlined method for programmatically executing structure alignment calculations</li> </ul> <div style="height: 20px;"></div><p><a href="https://groups.google.com/a/rcsb.org/g/api/about">Stay up-to-date with API developments by viewing (or subscribing) to the RCSB PDB API announcements Google group.</a></p> <a class="content-anchor" id="data-api"></a> <h3>Data API</h3> <p>All static data that is exposed in rcsb.org is available in the Data API. The schema follows the <a href="https://mmcif.wwpdb.org/" target="_blank">mmCIF dictionary</a>, extended with annotations coming from external resources. The core PDB data is split up into core objects, one per level of the structural data hierarchy, with entity subdivided into polymeric and non-polymeric subschemas (differing from the mmCIF dictionary). These are some of the core objects:</p> <ul style="list-style-type:disc;"> <li><b>core_entry</b>: data that relates to a PDB entry or Computed Structure Model (CSM). Identified by an entry_id, which can be an alphanumeric PDB-ID or a CSM-ID that starts with AF_ or MA_</li> <li><b>core_polymer_entity</b>: data for each polymeric molecular entity in an entry (e.g., protein, DNA, and RNA). Identified by entry ID and entity ID separated by a _ character, e.g. 3PQR_1</li> <li><b>core_nonpolymer_entity</b>: data for each non-polymeric small chemical entity in an entry (e.g., enzyme cofactors, ligands, ions, etc). Identified by entry ID and entity ID separated by a _ character </li> <li><b>core_branched_entity</b>: data for branched molecules (e.g., oligosaccharides). Identified by entry ID and entity ID separated by a _ character</li> <li><b>core_assembly</b>: data for each biological assembly in an entry. Identified by entry ID and assembly ID separated by a _ character</li> <li><b>core_polymer_entity_instance</b>: an instance of a certain polymeric molecular entity, also known as chain. Identified by entry ID and asym ID separated by a _ character</li> <li><b>core_chem_comp</b>: a chemical component. Identified by a unique alphanumeric code chem_comp_id</li> </ul> <div style="height: 20px;"></div><p>Both internal additions to the mmCIF dictionary and external resources annotations are prefixed with <code style="user-select: auto; padding: 2px 4px; font-size: 90%; color: #c7254e; background-color: #f9f2f4; border-radius: 4px;"> rcsb_</code>. In each core object, the <code style="user-select: auto; padding: 2px 4px; font-size: 90%; color: #c7254e; background-color: #f9f2f4; border-radius: 4px;"> rcsb_&ltcore_object&gt_container_identifiers</code> field holds the cardinal identifiers for the objects and any parent/child. Additionally every core object contains a single string identifier in field <code style="user-select: auto; padding: 2px 4px; font-size: 90%; color: #c7254e; background-color: #f9f2f4; border-radius: 4px;"> rcsb_id</code>.</p> <p>The data is available via 2 different interfaces:</p> <a class="content-anchor" id="rest-api-full-reference"></a> <h4><a href="//data.rcsb.org/redoc/index.html" target="_blank" rel="noopener" >REST API Full Reference</a></h4> <p>The REST API permits the retrieval of all data for one core object at a time.</p> <a class="content-anchor" id="graphql-api-graphiql-interface"></a> <h4><a href="//data.rcsb.org/graphql/index.html" target="_blank" rel="noopener" >GraphQL API (Graph<em>i</em>QL interface)</a></h4> <p>The <a href="https://graphql.org/" target="_blank" rel="noopener" >GraphQL</a> interface offers more flexible data retrieval, essentially making it possible to grab any piece of data from any level of the hierarchy in a single query. To use it programmatically POST your GraphQL queries under the <code style="user-select: auto; padding: 2px 4px; font-size: 90%; color: #c7254e; background-color: #f9f2f4; border-radius: 4px;">data.rcsb.org/graphql</code> endpoint.</p> <p>All output from both REST and GraphQL interfaces is offered in JSON format.</p> <a class="content-anchor" id="data-api-tutorial"></a> <h4><a href="//data.rcsb.org/index.html" target="_blank" rel="noopener" >Data API Tutorial</a></h4> <a class="content-anchor" id="search-api"></a> <h3>Search API</h3> <p>The search API programmatically exposes all search functionality available at rcsb.org. It is possible to perform queries with arbitrary Boolean logic across all data available in the RCSB PDB data API via a convenient JSON-format query language. At the root level it is also possible to combine <strong>text-based searches</strong> (any text/numerical field in the RCSB PDB data API) with <strong>protein/nucleotide sequence search</strong> (<a href="https://github.com/soedinglab/MMseqs2" target="_blank" rel="noopener" >mmseqs2 software</a>) and <strong>Structure similarity searches</strong> (BioZernike software, described in <a href="https://journals.plos.org/ploscompbiol/article?id=10.1371/journal.pcbi.1007970" target="_blank" rel="noopener" >Guzenko et al 2020</a>). All output from the Search API is offered in JSON format.</p> <a class="content-anchor" id="search-api-tutorial"></a> <h4><a href="//search.rcsb.org/index.html" target="_blank" rel="noopener" >Search API Tutorial</a></h4> <a class="content-anchor" id="search-api-full-reference"></a> <h4><a href="//search.rcsb.org/redoc/index.html" target="_blank" rel="noopener" >Search API Full Reference</a></h4> <p>This Search API example shows how to find <a href="https://search.rcsb.org/#search-example-15" target="_blank">all PDB structures and CSMs for a given UniProtKB sequence</a></p> <a class="content-anchor" id="python-api-client"></a> <h4>Python API Client</h4> <p>The <a href="https://rcsbsearchapi.readthedocs.io/en/latest/" target="_blank">rcsbsearchapi</a> package provides a Python interface to the RCSB PDB Search API. You can use it to fetch lists of PDB IDs corresponding to advanced query searches. RCSB PDB maintains the current version of this package on聽<a href="https://github.com/rcsb/py-rcsbsearchapi">GitHub</a>. The package was originally developed by聽<a href="https://github.com/sbliven" >Spencer Bliven</a>聽and聽<a href="/news/feature/65a1acf5c76ca3abcc925d0b">updated by several others</a>.</p> <a class="content-anchor" id="modelserver-api"></a> <h3>ModelServer API</h3> <p>The ModelServer is a service for accessing subsets of macromolecular model data. It delivers atomic coordinates together with annotations in the primary data files in a compressed BinaryCIF encoding (BCIF). Structure data can be served at different levels of granularity (<em>e.g.</em>, assembly, polymer chain, ligand), and ligand data may also be delivered in popular chemical informatics formats (<em>e.g.</em>, SDF, MOL, MOL2).</p> <a class="content-anchor" id="modelserver-api-specification"></a> <h4><a href="//models.rcsb.org/" target="_blank" rel="noopener" >ModelServer API Specification</a></h4> <p>The specification of the BinaryCIF format can be found at: <a href="https://github.com/molstar/BinaryCIF" target="_blank" rel="noopener" >https://github.com/molstar/BinaryCIF</a>.</p> <a class="content-anchor" id="volumeserver-api"></a> <h3>VolumeServer API</h3> <p>The VolumeServer is a service for accessing subsets of volumetric data. It automatically downsamples the data depending on the volume of the requested region to reduce the bandwidth requirements and provide near-instant access to even the largest data sets.</p> <a class="content-anchor" id="volumeserver-api-specification"></a> <h4><a href="//maps.rcsb.org/" target="_blank" rel="noopener" >VolumeServer API Specification</a></h4> <p>Both ModelServer and VolumeServer are part of Mol* (D. Sehnal, A.S. Rose, J. Kovca, S.K. Burley, S. Velankar (2018) Mol*: Towards a common library and tools for web molecular graphics MolVA/EuroVis Proceedings.<a href="http://dl.acm.org/citation.cfm?id=3293509" target="_blank" rel="noopener" >doi:10.2312/molva.20181103</a>).</p> <a class="content-anchor" id="1d-coordinate-server-api"></a> <h3>1D Coordinate Server API</h3> <p>The RCSB PDB 1D Coordinate Server compiles alignments between structural and sequence databases and integrates protein positional features from multiple resources. Alignment data is available for NCBI <a href="https://www.ncbi.nlm.nih.gov/refseq/" target="_blank">RefSeq</a> (including protein and genomic sequences), <a href="https://www.uniprot.org" target="_blank">UniProt</a> and <a href="/" target="_blank">PDB</a> sequences. Protein positional features are integrated from <a href="https://www.uniprot.org" target="_blank">UniProt</a>, <a href="https://www.cathdb.info/">CATH</a>, <a href="https://scop.berkeley.edu" target="_blank">SCOPe</a> and <a href="/" target="_blank">RCSB PDB</a> and collected from the <a href="https://data.rcsb.org" target="_blank">RCSB PDB Data Warehouse</a>.</p> <a class="content-anchor" id="1d-coordinate-server-api-tutorial"></a> <h4><a href="//1d-coordinates.rcsb.org/" target="_blank">1D Coordinate Server API Tutorial</a></h4> <a class="content-anchor" id="alignment-api"></a> <h3>Alignment API</h3> <p>The Alignment API serves as a comprehensive platform for the seamless computation of structure alignments. Structure alignment focuses on making an optimal superposition of the 3D coordinates of biological macromolecules to establish a residue-residue correspondence between sequences of related structures. This API provides a streamlined method for programmatically executing structure alignment calculations.</p> <a class="content-anchor" id="alignment-api-tutorial"></a> <h4><a href="//alignment.rcsb.org/" target="_blank">Alignment API Tutorial</a></h4> <a class="content-anchor" id="api-rate-limits"></a> <h3>API Rate Limits</h3> <p>The RCSB PDB APIs implement rate-limiting measures to ensure fair usage. While access to static files is not restricted, all RCSB PDB APIs have rate limits in place. We recommend starting with a handful of requests per second. If you exceed the limit, the service will respond with a 429 HTTP error code, indicating that you need to reduce your request rate as described below.<br /><br />If you encounter this error, you can retry your query after a short waiting period or add a waiting period after each request. The exponential backoff strategy, which gradually increases the time between retries, is a common way to find an acceptable request rate. Additionally, if you are using a public IP address that is shared with other users, such as certain universities or when using a VPN, you might encounter rate-limiting issues earlier due to shared resources.</p> <a class="content-anchor" id="license"></a> <h3><span id="license">License</span></h3> <p>RCSB PDB Web Services usage is available under the same terms and condition as RCSB PDB Web Portal (see <a href="/pages/policies">usage policies</a>)<br><br></p> <p><a href="/pages/contactus">Contact RCSB PDB</a> with questions or suggestions for specific services.</p> </div></div><br><hr><div class="item-info"><div>Please report any encountered broken links to <a href='mailto:info@rcsb.org'>info@rcsb.org</a></div><div>Last updated: 10/25/2024</div></div></div></div></div></div><div data-elastic-exclude><div class="hidden-print" id="footer_main"><div class="container" style="padding:0"><div class="row"><div class="col-md-6 col-sm-12" style="padding-left:0"> <div class="row"><div class="col-sm-4"><ul><li><span class="row_header">About</span></li><li><a href="/pages/about-us/index">About Us</a></li><li><a href="/pages/policies#References">Citing Us</a></li><li><a href="/pages/publications">Publications</a></li><li><a href="/pages/team">Team</a></li><li><a href="/pages/jobs">Careers</a></li><li><a href="/pages/policies">Usage & Privacy</a></li></ul></div><div class="col-sm-4" style="padding-left:0"><ul><li><span class="row_header">Support</span></li><li><a href="/pages/contactus">Contact Us</a></li><li><a href="/help">Help</a></li><li><a href="/docs/general-help/website-faq">Website FAQ</a></li><li><a href="/docs/general-help/glossary">Glossary</a></li><li><a href="https://status.rcsb.org/" target="_blank">Service Status</a></li></ul></div><div class="col-md-4 hidden-sm"></div></div></div><div class="col-md-6 col-sm-12" style="padding-left:5px"> <div class="row"><div class="col-sm-4"><p class="row_header">RCSB PDB is hosted by</p><div class="footerLogos"><hr><a href="http://www.rutgers.edu/"><img class="Rutgerslogo" src="https://cdn.rcsb.org/rcsb-pdb//v2/common/images/Logo_Rutgers-2024.png" alt="Rutgers University logo"></a><hr><a href="https://ucsd.edu/"><img class="UCSDlogo" src="https://cdn.rcsb.org/rcsb-pdb//v2/common/images/Logo_UCSD-navy.png" alt="Uiversity of California San Diego logo"></a><a href="https://www.sdsc.edu/"><img class="SDSClogo" src="https://cdn.rcsb.org/rcsb-pdb//v2/common/images/Logo_SDSC-black.png" alt="San Diego Supercomputer Center logo"></a><hr><a href="https://www.ucsf.edu/"><img class="UCSFlogo" src="https://cdn.rcsb.org/rcsb-pdb//v2/common/images/Logo_UCSF.png" alt="University of California San Francisco Logo"></a></div></div><div class="col-sm-4"><p class="row_header">RCSB PDB is a member of the</p><div class="footerLogos"><span id="pdbmembers_footer"><hr><a href="https://www.wwpdb.org" target="_blank" rel="noopener"><img class="wwpdblogo" src="https://cdn.rcsb.org/rcsb-pdb//v2/common/images/Logo_wwpdb.png" alt="wwPDB"></a><hr><a href="https://www.emdataresource.org" target="_blank" rel="noopener"><img id="emdatabanklogo_footer" src="https://cdn.rcsb.org/rcsb-pdb//v2/common/images/EMDataResourcelogo.png" alt="EMDataResource"></a></span></div></div><div class="col-sm-4"><ul><li><span class="row_header">RCSB Partners</span></li><li><a href="https://nakb.org/" target="_blank" rel="noopener">Nucleic Acid Knowledgebase</a></li></ul><ul><li><span class="row_header"><a href="https://www.wwpdb.org/" target="_blank" rel="noopener" style="text-decoration: none; color: black">wwPDB Partners</a></span></li><li><a href="/">RCSB PDB</a></li><li><a href="https://www.ebi.ac.uk/pdbe/" target="_blank" rel="noopener">PDBe</a></li><li><a href="https://www.pdbj.org/" target="_blank" rel="noopener">PDBj</a></li><li><a href="https://bmrb.io/" target="_blank" rel="noopener">BMRB</a></li><li><a href="https://emdb-empiar.org/" target="_blank" rel="noopener">EMDB</a></li></ul></div></div></div></div></div></div><div id="footer_grant"><div class="container"><div class="row"><p>RCSB PDB Core Operations are funded by the <a href="http://www.nsf.gov/" target="_blank" rel="noopener">U.S. National Science Foundation</a> (DBI-2321666), the <a href="http://science.energy.gov/" target="_blank" rel="noopener">US Department of Energy</a> (DE-SC0019749), and the <a href="http://www.cancer.gov/" target="_blank" rel="noopener">National Cancer Institute</a>, <a href="http://www.niaid.nih.gov/" target="_blank" rel="noopener">National Institute of Allergy and Infectious Diseases</a>, and <a href="http://www.nigms.nih.gov/" target="_blank" rel="noopener">National Institute of General Medical Sciences</a> of the <a href="http://www.nih.gov/" target="_blank" rel="noopener">National Institutes of Health</a> under grant R01GM157729.</p></div></div></div><div id="jira-fdbck"></div></div></div></body></html>